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REPAIR - TM-5-4210-220-12_585
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REPAIR (cont) - TM-5-4210-220-12_587
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued 4-24.14  AC Electrical System - Continued b. K1 Relay Repair NOTE Always check out K2 relay before checking out K1 relay.  This is detailed in a preceding. (1) Open the inverter as detailed in a preceding, steps 5 thru 8. (2) Locate  K1  relay  and  with  battery  switch  set  to  BOTH but  Ignition  off,  connect  a  voltmeter  between  the  two small terminals on top of the relay (the coil). (3) Without depressing the start button, voltage should be 0 Vdc.  With start button depressed, voltage should be 10 Vdc or higher. (4) If  it  is  zero  with  start  button  depressed  recheck  K2 relay as detailed in a preceding. (5) Check the resistance across the two large terminals at the top of the relay with an ohmmeter (6) Without depressing start button, resistance should be greater than 100 kOhms (7) With start button depressed, resistance should be less than 5 ohms (8) Replace relay K1 if either of these readings is not obtained (9) Replace inverter as detailed in steps 13 and 14 of K2 Relay Repair preceding c. Voltage Regulator PCBI and PCB3 Repair (1) Connect  the  4-2400  Test   Strip   to   the   Dynamic Inverter plug on front panel of inverter (2) Set battery switch to BOTH and the ignition switch to ON, but the engine not running (3) Measure voltage between blue and green on test strip (4) Without  depressing  the  start  button,  the  voltage should  be  10  Vdc  or  higher.    If  not,  replace  the regulator, PCB3, see 6 following (5) With    the    start    button    depressed,    the    voltage should  be  10  Vdc  or  higher.    If  not,  replace  the regulator PCB1, as detailed following 4-464

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